.1 file extension

This is the basic program to work with .1 extension

StuffIt Standard

StuffIt Standard StuffIt Compressed File

Stuffit Standard is a file compression software that has a great performance with multiple file support. It is very easy to use an install, with a friendly user interface letting the users enjoy the software in all the aspects about functionality and design. Its multiple options make it one of the best options of this type of software... (more)

The program works with the following extensions: gz, rar, tgz, z, as, pf, uu, arj, arc, bz2, pak, lha, lzh, sas, tar, uue, bin, b64, hqx, mim, mime, tbz2 and 1

.1 extension is also supported by the following programs:

StuffIt Deluxe

StuffIt Deluxe StuffIt Compressed File

Stuffit Deluxe is a file compression and management tool.
eDrawings for Pro/ENGINEER

eDrawings for Pro/ENGINEER Pro/ENGINEER Versioned File

Publish and share accurate representations of 2D and 3D product design data.

Pro/ENGINEER Pro/ENGINEER Versioned File

Pro/ENGINEER is the standard in 3D product design.